Summary

• A vulnerability in the packet processing functions of Cisco FirePOWER System Software could allow an unauthenticated, remote attacker to cause an affected system to stop inspecting and processing packets, resulting in a denial of service (DoS) condition.
  
  The vulnerability is due to improper packet handling by the affected software when packets are passed through the sensing interfaces of an affected system. An attacker could exploit this vulnerability by sending crafted packets through a targeted system.
  
  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
  
  This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160504-firepower

Affected Products

• Vulnerable Products

  This vulnerability affects Cisco FirePOWER System Software releases 5.3.0 through 5.3.0.6 and 5.4.0 through 5.4.0.3 when running on the following Cisco products:
  

  • Cisco FirePOWER 7000 Series Appliances
  • Cisco FirePOWER 8000 Series Appliances
  • Cisco Advanced Malware Protection (AMP) for Networks running on Cisco FirePOWER 7000 Series Appliances
  • Cisco Advanced Malware Protection (AMP) for Networks running on Cisco FirePOWER 8000 Series Appliances

  
  
  Determining the Cisco FirePOWER System Software Release
  
  To determine which release of Cisco FirePOWER System Software is running on a device, administrators can use Cisco Firepower Management Center or the command-line interface (CLI).
  
  To use Cisco Firepower Management Center, navigate to Devices > Device Management in the user interface, and then double-click the name of the device.
  
  To use the CLI, issue the show version command. Administrators can access the CLI via the serial console or an SSH session to the management interface of the device. The following example shows the output of the show version command for a Cisco FirePOWER 8130 appliance that is running Cisco FirePOWER System Software Release 5.4.0.3:
  
  

  > show version
  ------------------[ Sourcefire3D ]------------------
  Model                     : Cisco FirePOWER 8130 (63) Version 5.4.0.3 (Build xx)
  
  .
  .
  .

  Products Confirmed Not Vulnerable

  No other Cisco products are currently known to be affected by this vulnerability.
  
  Cisco has confirmed that this vulnerability does not affect the following Cisco products:
  

  • Adaptive Security Appliance (ASA) 5500-X with FirePOWER Services
  • Firepower 4100 Series Appliances
  • Firepower 9300 Security Appliances
  • Firepower Management Center
  • FirePOWER Threat Defense for Integrated Services Routers (ISRs)
  • Next-Generation Intrusion Prevention System (NGIPS) for Blue Coat X-Series
  • Snort Intrusion Prevention System (IPS) for Integrated Services Routers (ISRs)
  • Sourcefire 3D System Appliances
  • Virtual Next-Generation Intrusion Prevention System (NGIPSv) for VMware

Workarounds

• There are no workarounds that address this vulnerability.

Fixed Software

• Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:
  http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html
  
  Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.
  
  When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
  
  In all cases, customers should ensure that the devices to upgrade contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
  
  Customers Without Service Contracts
  
  Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC):
  http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html
  
  Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.
  
  Fixed Releases
  
  Customers should upgrade to an appropriate release as indicated in the following table:
  
  

  Cisco FirePOWER System Software Major Release	First Fixed Release
  5.3.0	5.3.0.7
  5.4.0	5.4.0.4
  6.0	Not affected

  
  
  To install the appropriate fixed release, customers should use the software update features of Cisco Firepower Management Center.

Exploitation and Public Announcements

• The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

Source

• This vulnerability was found during the resolution of support cases.

URL

• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160504-firepower

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	—	Final	2016-May-04

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